借助于硝酸镍溶液,利用浸渍法在堇青石表面均匀负载镍催化剂颗粒,在甲烷扩散火焰中活化并催化牛成碳纳米管.实验结果表明,生成的多壁碳纳米管直径为30~50nm,长度约为十几微米,空腔比较小,管壁石墨结晶结构良好.提高浸渍液浓度,催化剂颗粒尺寸明显变大,但对碳纳米管的形态影响比较小.延长浸渍时间,可使催化剂颗粒密度提高,碳纳米管出现成束生长现象.结合碳管成核牛长过程和火焰燃烧的特点,探讨了催化剂对于碳纳米管生长的影响机制.
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